Electron Diffraction - Boston University
electron beam. The beam will have kinetic energy equal to the change in electric potential energy (eVa). If the beam velocity is non–relativistic (eVa<<mc2), we have at the anode: 1 2 mv 2 = eVa (3) CARBON TARGET As the electron beam passes into the anode, it strikes a very fine nickel screen which holds vaporized graphite (carbon).
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